Sally is a small supporting role. She's very sweet and optimistic on the outside. She frequently does what she can to keep the group morale up, organizing group activities and socializing every day. But deep down, she despises herself. This performative mask of hers cracks from time to time. Her kindness never falters, even when she truly believes it isn't real, that she's faking it. She's an actress, after all. 

Voice headcannon is any. I have no idea what to do with her.